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Characterization of a new Partitivirus Strain in Verticillium dahliae provides further evidence of the spread of the highly virulent defoliating pathotype through new introductions

AuthorsCañizares, M. Carmen; Pérez-Artés, Encarnación ; García-Pedrajas, Nicolás Emilio; García-Pedrajas, María D.
Issue DateOct-2014
CitationXVII Congreso de la Sociedad Española de Fitopatología (2014)
AbstractThe soilborne pathogen Verticillium dahliae, causal agent of Veticillium wilt, has a worldwide distribution and a plethora of hosts of agronomic value. The spread of a highly virulent defoliating (D) pathotype has greatly increased the threat posed by V. dahliae in olive trees. For disease management, it is important to know if the D pathotype is spreading from contaminated material worldwide, or if D isolates may have originated from native V. dahliae populations several times. In this work, we provide evidence to support the hypothesis of long-distance movement of V. dahliae isolates. We identified a double-strand RNA mycovirus in an olive D isolate from Turkey. Sequencing and phylogenetic analysis clustered it with members of the family Partitiviridae. Interestingly, it was most similar to a partitivirus previously identified in a V. dahliae cotton isolate from China (VdPV1), with sequence identities of 94% and 91% at the nucleotide level for RNA1 and RNA2, respectively. It corresponded therefore to a strain of the established species, and we designated it VdPV1-ol (VdPV1 from olive). V. dahliae has been described as an asexually-reproducing fungus in which exchange of genetic material is restricted to isolates in the same vegetative compatibility group. Mycoviruses are among the genetic elements that can be readily exchanged between compatible isolates. The identification of the same viral species in these two geographically distant fungal isolates provides evidence of their relationships. We propose that micoviruses can serve as fingerprints to study geographical flows in V. dahliae.
DescriptionTrabajo presentado en el XVII Congreso de la Sociedad Española de Fitopatología, celebrado en Lleida del 7 al 10 de octubre de 2014.
Appears in Collections:(IHSM) Comunicaciones congresos
(IAS) Comunicaciones congresos
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